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I'm not up to date on US prices (I'm in Australia) but how much of a perfectionist are you? You're probably unlikely to get 'perfect' video (particularly without the rolling shutter effect) out of any Nikon DSLR. I have a Nikon D7000 and it's better than the D90 but it's not perfect.

Video recording quality seems to improve with each new generation of DSLRs so pick the most recent mid range DSLR you can afford for your budget and that's probably as good as you'll get.

High quality Novoflex lens adapters with adapter-based aperture control for these cameras cost $260 for the Panasonics and about $293 for the Sony. Voigtlander adapters are $179 for the Panasonics and the same for the Sony. If Novoflex or Voigtlander adapters are out of your budget range, you can get far less expensive adapters of Asian origin (about $25). You will need to set your aperture and focus manually with all of these adapters.

Ry - sorry if I wasn't clear. Your Nikkors will become manual focus lenses on anything but a Nikon body.

That said, I would keep them, buy the GH3, a $27 adapter for your Nikkors and a used 14-140 (about $500 on eBay) for the GH3. Total price: less than $2000 for a great camera with a 10:1 auto lens and lightning fast autofocus- and the ability to mount your manual Nikkors when you need them.